Mulan

In a future world, you have purchased body changing nanites with the intention of giving yourself an idealized version of your own body. You were ready to activate them when you remember that you are babysitting your friends daughter Amber tonight. You watch Mulan together, then while you are making supper, your body begins to change. Somebody has activated the nanites! Instead of an idealized male body, you become a petite woman! You rush into the computer room and see Amber at your computer! it's too late, you are stuck!